公开(公告)号：US06553074B1

公开(公告)日：2003-04-22

申请号：US09271818

申请日：1999-03-18

申请人： Ofir Shalvi ,  Zvi Reznic ,  Etai Zaltsman

发明人： Ofir Shalvi ,  Zvi Reznic ,  Etai Zaltsman

IPC分类号： H04B1404

CPC分类号： H04L25/4927

摘要： A method and device for combating logarithmic quantization and Robbed Bit Signaling (RBS) impairments that..are typical to PCM telephone lines is descried. An apparatus is described which includes a front-end unit which receives samples of the digital PCM line, an impairment identifier unit which identifies samples that have a high likelihood to have, large impairments due to the PCM line, an impairment estimator unit which estimates the value of impairment caused by the digital line, a samples reconstructor unit which fixes received samples by subtracting from them the value of the estimated impairment and an output unit transfers the reconstructed samples to a receiver. The method allows improving signal quality at the output of the PCM line, and thus improving data rates and robustness of digital communication receivers, and particularly of V.34 receivers, or V.90 transceivers that are digitally linked to the PCM, line.

摘要翻译： 描述了一种用于对抗PCM电话线路的典型对数量化和Robbed Bit Signaling（RBS）损伤的方法和装置。 描述了一种装置，其包括接收数字PCM线路的采样的前端单元，识别具有高似然性的样本的损害标识符单元，所述损伤识别单元具有由于PCM线路造成的大的损伤，所述损伤估计器单元估计 由数字线引起的损害的值，样本重建单元，其通过从其中减去估计的损害的值来固定接收的样本，并且输出单元将重建的样本传送到接收器。 该方法允许改善PCM线输出端的信号质量，从而提高数字通信接收机，特别是数字连接到PCM线路的V.34接收机或V.90收发器的数据速率和鲁棒性。

公开(公告)号：US06463103B1

公开(公告)日：2002-10-08

申请号：US09657769

申请日：2000-09-08

申请人： Ping Dong ,  Kuo-Yu Lin

发明人： Ping Dong ,  Kuo-Yu Lin

IPC分类号： H04B1404

CPC分类号： H04B14/04

摘要： A spectral shaping PCM modem communication system uses a symbol encoder to encode a data bit stream into a PCM symbol stream. A plurality of different frames are formed from the PCM symbol stream. Performance metrics are computed for each possible frame and its inversion so a decision can be made in order to select a most desirable frame and inversion Delays are injected in the data flow to allow a look-ahead and thus provide for better frame selection and inversion decisions. A channel multiplexer combines decision bits and output frames to form encoded output frames that are fed to a digital channel connected to a telephone network wherein they are converted to analog signal. A corresponding decoder converts analog signals from the telephone network to digital signals. A timing recovery and equalization means corrects sample timing and removes inter-symbol interference effects introduced by telephone networks. The output of the equalizer is sampled at correct timing to recover the received samples and received frame. A channel de-multiplexer separates the frame selection and frame inversion decision bits from the symbol frames received. Inversion and framing decisions are discerned from the demultiplexed frame selection and frame inversion decision bits. Original PCM symbol frames are reconstructed and PCM symbols are decoded into a data bit stream. A non-negative shell mapping may be used as the symbol encoder. A decoder checks to see if a currently received frame is negative. If it is, then all samples in such current frame are inverted. Otherwise, all samples in the current frame are unchanged. The resulting frames are then forwarded to a non-negative shell mapping decoder for eventual reconversion to digital data.

摘要翻译： 频谱整形PCM调制解调器通信系统使用符号编码器将数据比特流编码成PCM符号流。 从PCM符号流形成多个不同的帧。 针对每个可能的帧及其反演来计算性能度量，以便可以做出决定以便选择最理想的帧和反演延迟被注入到数据流中以允许先行，从而提供更好的帧选择和反演决策 。 信道多路复合器组合决策位和输出帧以形成被馈送到连接到电话网络的数字信道的编码输出帧，其中它们被转换为模拟信号。 相应的解码器将来自电话网络的模拟信号转换成数字信号。 定时恢复和均衡意味着校正采样定时并消除电话网络引入的符号间干扰效应。 在正确的定时对均衡器的输出进行采样，以恢复接收到的采样和接收的帧。 信道解复用器将帧选择和帧反转决策位与接收的符号帧分离。 从解复用的帧选择和帧反转决定位中辨别反转和成帧决策。 原始PCM符号帧被重建并且PCM符号被解码成数据比特流。 可以使用非负外壳映射作为符号编码器。 解码器检查当前接收的帧是否为负。 如果是，则当前帧中的所有样本都被反转。 否则，当前帧中的所有样本都不变。 然后将所得到的帧转发到非负壳映射解码器，以最终重新转换为数字数据。

公开(公告)号：US06356593B1

公开(公告)日：2002-03-12

申请号：US09067895

申请日：1998-04-28

申请人： Nuri Ruhi Dagedeviren ,  Lynn Emery Ditty ,  Donald Lars Duttweiler ,  Gerard Joseph Pepenella ,  Dewayne Alan Spires

发明人： Nuri Ruhi Dagedeviren ,  Lynn Emery Ditty ,  Donald Lars Duttweiler ,  Gerard Joseph Pepenella ,  Dewayne Alan Spires

IPC分类号： H04B1404

CPC分类号： H04M11/066 ,  H04L5/1438 ,  H04L25/4927 ,  H04L25/497 ,  H04L25/4975

摘要： Quantization noise, introduced into data transmission when analog signals are translated into PCM code using the logarithmic conversion of &mgr;-law or A-law rules necessary to accommodate the transmission of voice signals, limits the maximum attainable speed of data transmission. However, when the PCM code signals represent data (rather than voice signals), linear conversion of analog data signals into the PCM code would avoid such logarithmic quantization noise. To signal the translating codec that a digital modem call is being made, the digital modem allocates one or more of the least significant bit positions of the code representing the 2100 Hz answer-tone-with-phase-reversal (specified in ITU-T Recommendation G. 165) to send a repetitive pattern “P1” to signal to the associated codec that a digital modem connection has been made. When the codec detects the P1 pattern it will linearly convert analog data signals into PCM code, thereby reducing the introduction of logarithmic quantization noise.

摘要翻译： 当使用适应语音信号传输所需的μ律或A律规则的对数转换将模拟信号转换成PCM码时，引入数据传输的量化噪声限制了数据传输的最大可达到的速度。 然而，当PCM码信号表示数据（而不是语音信号）时，模拟数据信号到PCM码的线性转换将避免这种对数量化噪声。 为了向转换编解码器发信号通知数字调制解调器呼叫，数字调制解调器分配代表2100Hz应答音 - 相位反转的代码的最低有效位位置中的一个或多个（在ITU-T建议书 发送重复模式“P1”以向相关联的编解码器发信号以发送数字调制解调器连接。 当编解码器检测到P1模式时，它会将模拟数据信号线性转换成PCM码，从而减少对数量化噪声的引入。

公开(公告)号：US06765967B2

公开(公告)日：2004-07-20

申请号：US10365829

申请日：2003-02-14

申请人： Eric Morgan Dowling

发明人： Eric Morgan Dowling

IPC分类号： H04B1404

CPC分类号： H04B3/23 ,  H04L5/14 ,  H04L25/03878

摘要： A high-speed analog subscriber modem operates at speeds as high as 64 kbps in both the downlink and uplink directions using a standard POTS line augmented with an enhanced codec. This enables increased upload speeds and supports 56 kbps peer-to-peer analog subscriber connections. An enhanced network codec according to the present invention supports on a POTS line both high-speed modem communications and standard PCM speech communication. The enhanced codec of the present invention may be designed to be plug-compatible with existing codecs and may be used to upgrade POTS service to support data rates approaching 64 kbps. Similarly, the present invention may be used to increase the use of the POTS channel in a DSL system.

摘要翻译： 高速模拟用户调制解调器在下行链路和上行链路方向上以高达64kbps的速度运行，使用增强的编解码器增加的标准POTS线路。 这样可以提高上传速度，并支持56 kbps的点对点模拟用户连接。 根据本发明的增强型网络编解码器在POTS线上支持高速调制解调器通信和标准PCM话音通信。 本发明的增强型编解码器可以被设计为与现有编解码器插头兼容，并且可以用于升级POTS服务以支持接近64kbps的数据速率。 类似地，本发明可以用于增加DSL系统中POTS信道的使用。

公开(公告)号：US06728319B1

公开(公告)日：2004-04-27

申请号：US09582300

申请日：2000-06-22

申请人： Per Johan Anders Nyström ,  Björn Stig Erik Johansson ,  Tomas Gunde Svensson

发明人： Per Johan Anders Nyström ,  Björn Stig Erik Johansson ,  Tomas Gunde Svensson

IPC分类号： H04B1404

CPC分类号： H03M7/3082

摘要： A decoder in a communication system using channel optimized vector quantization and including an encoder stores active encoder centroids ci corresponding to active indices i, an active index being defined as an index that has a predetermined source probability pi>0 of being selected by the encoder for transmission to the decoder, source probabilities pi and the bit error rate epsilon to dynamically estimate a decoded vector using a sub-optimal algorithm in which only the most significant contributions are considered.

摘要翻译： 在使用信道优化矢量量化并且包括编码器的通信系统中的解码器存储对应于有效索引i的活动编码器质心ci，活动索引被定义为具有由编码器选择的预定源概率pi> 0的索引， 传输到解码器，源概率pi和误码率ε，以使用仅考虑最重要贡献的次优算法动态估计解码矢量。

公开(公告)号：US06643270B1

公开(公告)日：2003-11-04

申请号：US09057292

申请日：1998-04-08

申请人： Victor Demjanenko ,  Frederic J. Hirzel

发明人： Victor Demjanenko ,  Frederic J. Hirzel

IPC分类号： H04B1404

CPC分类号： H04M1/74 ,  H04L12/66 ,  H04L25/4927

摘要： Methods of determining systemic impairments in a telecommunications network comprise sending a candidate set of digital symbols from a digital modem to an analog modem. The symbols are affected by systemic impairments in the network. Data information symbols or mapping tables are derived in the analog modem. The data information symbols or mapping tables are then provided to the digital modem. The digital modem may use the data information symbols or mapping tables in a variety of manners, such as for data transmission, spectral shaping, echo cancellation, or adaptation to robbed bit signaling.

摘要翻译： 确定电信网络系统损伤的方法包括将数字符号的候选集从数字调制解调器发送到模拟调制解调器。 这些符号受到网络系统损伤的影响。 在模拟调制解调器中导出数据信息符号或映射表。 然后将数据信息符号或映射表提供给数字调制解调器。 数字调制解调器可以以各种方式使用数据信息符号或映射表，例如用于数据传输，频谱整形，回声消除或对抢占位信令的适配。

公开(公告)号：US06577683B1

公开(公告)日：2003-06-10

申请号：US09342160

申请日：1999-06-17

申请人： Mark A. Waldron ,  Scott A. Lery

发明人： Mark A. Waldron ,  Scott A. Lery

IPC分类号： H04B1404

CPC分类号： H04B14/048

摘要： A method and device for generating a constellation of Pulse Code Modulation (PCM) levels to represent digital data in a communication system. The constellation of Pulse Code Modulation levels are selected to have a total number of PCM levels and an upper power limit that optimizes noise performance. PCM levels are selected to increase the minimum spacing between PCM levels as great as possible while staying within the upper power limit for a constellation having a desired number of PCM levels. To minimize the power level of the selected constellation, constellation points are selected starting from PCM levels at linear values near zero to PCM levels at higher linear values. To improve noise performance, the number of occurrences of the minimum distance between PCM levels is also reduced without exceeding the upper power level. To reduce occurrences of the minimum distance between constellation points, PCM levels at the minimum distance from the previously selected PCM level may be skipped. The number of PCM levels spaced at the minimum distance is thus reduced to an optimum number without exceeding the upper power level.

摘要翻译： 一种用于在通信系统中生成用于表示数字数据的脉冲编码调制（PCM）级别的星座的方法和装置。 脉冲编码调制级别的星座被选择为具有PCM级别的总数和上限功率限制，可以优化噪声性能。 选择PCM电平以尽可能大地增加PCM电平之间的最小间隔，同时对于具有期望数量的PCM电平的星座保持在上限功率限制内。 为了最小化所选星座的功率电平，从线性值接近零的PCM电平开始，以较高线性值从PCM电平开始选择星座点。 为了提高噪声性能，PCM电平之间的最小距离的出现次数也降低，而不超过上功率电平。 为了减少星座点之间的最小距离的出现，可能会跳过距离先前选择的PCM级别最小距离的PCM级别。 因此，以最小距离间隔的PCM级数减少到最佳数量而不超过上功率级。

公开(公告)号：US06480550B1

公开(公告)日：2002-11-12

申请号：US09077836

申请日：1998-11-03

申请人： Gerhard Zimmermann

发明人： Gerhard Zimmermann

IPC分类号： H04B1404

CPC分类号： H03M7/3044 ,  H03M7/3053

摘要： Described is a method of compressing an analogue signal, e.g. a voice signal, the signal function being continuously sampled, quantized and encoded into data words, the difference between each two successive data words determined and each difference value quantized and encoded.

摘要翻译： 描述了一种压缩模拟信号的方法，例如， 语音信号，信号功能被连续采样，量化并编码成数据字，确定每两个连续数据字之间的差值，并对每个差值进行量化和编码。

公开(公告)号：US06298091B1

公开(公告)日：2001-10-02

申请号：US09046283

申请日：1998-03-23

申请人： Daniel J. Buerkle ,  Bryan J. Lloyd ,  Ronald S. Svec

发明人： Daniel J. Buerkle ,  Bryan J. Lloyd ,  Ronald S. Svec

IPC分类号： H04B1404

CPC分类号： H04N21/4341 ,  H04B14/04 ,  H04N19/42 ,  H04N19/61 ,  H04N21/2368 ,  H04N21/426 ,  H04N21/4382 ,  H04N21/4435 ,  H04N21/84

摘要： A method and system of operating a digital data decoder. In accordance with this method, a first stream of encoded data is transmitted to the decoder, and a second stream of encoded data is stored in a memory device. One of the first and second streams of encoded data is selected, and the decoder is used to decode that selected stream of encoded data. This second stream of data could have been placed in the memory device by other devices or processes present in an STB system. In this case, all the decoder needs to process the data is a pointer to it and some additional information about, for example, its size. Since the processor has access to all memory, it can do any necessary parsing/manipulation required by the stream format. This provides a large degree of flexibility in this area. The processor can then pass location and attributes of data to the decoder. This also minimizes data movement to/from memory, reducing bandwidth requirements.

摘要翻译： 一种操作数字数据解码器的方法和系统。 根据该方法，将第一编码数据流发送到解码器，并将第二编码数据流存储在存储器件中。 选择第一和第二编码数据流之一，并且解码器用于解码所选择的编码数据流。 该第二数据流可以由STB系统中存在的其他设备或处理而被放置在存储器设备中。 在这种情况下，所有解码器需要处理的数据是指向它的指针和一些关于例如其大小的附加信息。 由于处理器可以访问所有内存，因此可以进行流格式所需的任何必要的解析/操作。 这在这方面提供了很大的灵活性。 然后，处理器可以将数据的位置和属性传递给解码器。 这也最大限度地减少了对内存的数据移动，从而减少了带宽需求。

公开(公告)号：US06259742B1

公开(公告)日：2001-07-10

申请号：US08972960

申请日：1997-11-19

申请人： Sverrir Olafsson ,  Olafur Orn Jonsson

发明人： Sverrir Olafsson ,  Olafur Orn Jonsson

IPC分类号： H04B1404

CPC分类号： H04L25/4927

摘要： To compensate for the substantially non-uniform spacing of constellation points in a pulse code modulation modem, the transmitting power efficiency is substantially maximized while substantially limiting the complexity of the mapping. To optimize the transmitting power efficiency, the present invention suitably determines an approximate cost function g(n) to reduce the complexity and the 2K lowest cost N-tuples (m0,m1, . . . ,mN-1) for power transmission efficiency. Knowing the lowest cost N-tuples, fractional K data bits are systematically mapped uniformly onto the 2K lowest cost N-tuples.

摘要翻译： 为了补偿脉冲编码调制调制解调器中的星座点的基本不均匀的间隔，发射功率效率基本上最大化，同时基本上限制了映射的复杂度。 为了优化传输功率效率，本发明适当地确定了用于降低传输效率的复杂度和2K最低成本N元组（m0，m1，...，mN-1）的近似成本函数g（n）。 知道最低成本的N元组，将小数K数据位系统地映射到2K最低成本的N元组上。